Crustal structure of the Java margin from seismic wide-angle and multichannel reflection data.

Kopp, Heidrun , Klaeschen, Dirk , Flueh, Ernst R., Bialas, Jörg and Reichert, C. (2002) Crustal structure of the Java margin from seismic wide-angle and multichannel reflection data. Open Access Journal of Geophysical Research: Solid Earth, 107 (B2). p. 2034. DOI 10.1029/2000JB000095.

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Seismic investigations across the convergent Sunda margin off Indonesia provide a detailed image of the crustal architecture of the Sunda plate boundary. The combined analysis and interpretation of wide-angle and reflection seismic data along two coincident profiles across the subduction zone are complemented by additional lines within the forearc domain, which yield some three-dimensional (3-D) constraints on the velocity-depth structure across the margin. A detailed cross section of the subduction zone is presented, which is confirmed by supplementary gravity modeling. The Sunda convergence zone is a prime example of an accretionary margin, where sediment accretion has led to the formation of a massive accretionary prism, with a total width of >110 km between the trench and the forearc basin. It is composed of a frontal wedge which documents ongoing accretion and a fossil part behind the present backstop structure which constitutes the outer high. Moderate seismic velocities derived from wide-angle modeling indicate a sedimentary composition of the outer high. The subducting oceanic slab is traced to a depth of almost 30 km underneath the accretionary prism. The adjacent forearc domain is characterized by a pronounced morphological basin which is underlain by a layer of increased seismic velocities and a shallow upper plate Moho at 16 km depth. We speculate that remnant fragments of oceanic crust might be involved in the formation of this oceanic-type crust found at the leading edge of the upper plate beneath the forearc basin.

Document Type: Article
Keywords: Sunda subduction zone; Java margin; accretionary tectonics; forearc structure; seismic reflection; seismic refraction; R.V. Sonne; SO137; SO138
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1029/2000JB000095
ISSN: 2169-9356
Projects: GINCO
Date Deposited: 09 Dec 2009 11:02
Last Modified: 25 Apr 2018 09:51

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